Full-Text Search:
Home|About CNKI|User Service|中文
Add to Favorite Get Latest Update

The Discovery and Its Significance of Late Quaternary Involution in the Area of Lower Reach of Qingshuihe River,Ningxia,China

ZHANG Ke\ LIU Kaiyu\ YANG Jingchun (Department of Urban and Environmental Sciences,Peking University,Beijing,100871)  
In the lake\|face strata located in the lower reach of the Qingshuihe River,Ning xia with the latitude of 37 4° N and the elevation about 1?230?m,involution dated in late period of late Quaternary was discovered,which indicates that the south limit of permafrost had once expanded approximately to the latitude of 37 4° N in that time in Ningxia and that the annual mean temperature was 8~9℃ lower than today.Because the intensive tectonic uplift in the northeast margin o f Tibetan Plateau and cold and dry weather in the last glacial maximum,the Qings huihe River was so blocked that along the margin of the blocked\|lake the involu tion was developed.
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©CNKI All Rights Reserved